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LP8545 bảng dữ liệu(PDF) 18 Page - Texas Instruments

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tên linh kiện LP8545
Giải thích chi tiết về linh kiện  High-Efficiency LED Backlight Driver for Notebooks
PDF  44 Pages
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LP8545 bảng dữ liệu(HTML) 18 Page - Texas Instruments

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Brightness (PWM)
Time
Slope Time
Advanced slope
Brightness (PWM)
Sloper Input
PWM Output
Time
Normal slope
Steady state without dithering
If dither is enabled it will
be used during transition
to enable smooth effect
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
tSHIFT = 1/(FPWM x 6)
Shift time
1/(FPWM)
Cycle time
LP8545
SNVS635D – APRIL 2010 – REVISED DECEMBER 2013
www.ti.com
Figure 14. Phase Shift PWM Mode
Slope and Dithering
During transition between two brightness (PWM) values special dithering scheme is used if the slope is enabled.
It allows increased resolution and smaller average steps size. Dithering is not used in steady state condition.
Slope time can be programmed with EEPROM bits <SLOPE[3:0]> from 0 to 500 ms. Same slope time is used for
sloping up and down. Advanced slope makes brightness changes smooth for eye. Dithering can be programmed
with EEPROM bits <DITHER[1:0]> from 0 to 3 bits. Example below is for 1-bit dithering, e.g., for 3-bit dithering,
every 8th pulse is made 1 LSB longer to increase the average value by 1/8 of LSB.
Figure 15. Sloper Operation
18
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Product Folder Links: LP8545



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